Welded Pipe

Welded Pipes can be formed by hot or cold rolling plates and then welding the seam, this is the ERW and EFW manufacturing process. To be able to keep the outside also known as the O.D surface of a smooth finish a cutting tool is used called scarfing blade which is used to remove the weld flash.
Welded pipe manufacturing has improved over the years and techniques have advanced and there has been a switch to high-frequency electric currents for welding, whereas in the 1970s there was low-frequency current used. Low frequency welded pipes were more prone to corrosion and seam failure.